It's interesting this thread comes up now when in the last two days I've started experiencing input lag on my Magic Trackpad 2, which makes it "go all over the place."
In my case, it seems to be triggered when I put my iPhone (which has Bluetooth enabled) in a certain place on my desk near an Anker USB hub. But I've been doing that for a long time, and it's only recently that it's started giving me trouble.